Question

Draw a decagon (10sides) and nonagon(9 sides).

Answer 1

Using formula (n-2)x180 for each interior angle and draw segments and angles using a compass or protector then draw equal segments. You are done. But i think that you have to draw inside a circle.

Answer 2

.....,.............,.........draw a circle and with help of protector dive it in 9 equal parts to draw a nonagon